
\begin{tikzpicture}
  \coordinate[label=above:$A$] (A) at (2, 3);
  \coordinate[label=left:$B$] (B) at (-3, 2);
  \coordinate[label=below:$C$] (C) at (-1, -2);
  \coordinate[label=right:$D$] (D) at (3, -3);
  \draw (A) -- (B) -- (C) -- (D) -- cycle (A) -- (C);
\end{tikzpicture}
